Ground anchor



J. BLACKBURN GROUND ANCHOR July 24, 1934.A

Filed OCT.. 6, 1932 A TTORNE Y.

Patented July 24, 1934 GROUND ANCHOR Jasper Blackburn, Webster Groves,Mo.

Application October 6, 1932, Serial No. 636,461

1 Claim.

This invention relates to ground anchors for telegraph poles or thelike.

The primary object of the invention is to provide a unitary or one-pieceanchor of the formation of a hollow cone, which when seated in theground will tend to hold its seat through the operation of suctionwithin the hollow cone of the anchor, while the angular disposition ofthe walls of the cone relative to the axis thereof and relative to theside walls `of the hole in which the anchor is seated, will, under anystraight-out pull upon the anchor, tend to deflect any stone or rockpiled in the holeupon the anchor, radially outward against the sides ofthe hole, thus locking the anchor against withdrawal.

Another object is to provide an anchor Vof the kind referred to,consisting of a one-piece, hollow cone including a hub at its apex, anannular flange or foot portion extended flatly outward around its base,and a plurality of flat ribs outstanding upon the outer sides of itswalls and extending from the hub to the foot flange in a spoke-likerelation, whereby small rocks may become locked in between the adjacentribs and other rocks being piled thereupon and becoming wedged betweenthe locked rocks and the adjacent side walls of the hole in which theanchor is seated, the anchor is effectively locked against withdrawalunder stresses imposed upon the attached anchor rod.

With these and such further and additionaly objects and advantages inView as may be developed in the course of the following speciiication,at

tention is directed 'to the accompanying drawing as constituting a partof the specification, the same embodying a practical form of myinvention, and wherein Figure 1 is a side elevation of my improved formof anchor as in actual use, an anchor rod being shown attached thereto,and the ground within which is formed the hole for the seating of' theanchor being shown in section.

Figure 2 is a plan view of the anchor, the attached anchor rod beingshown in section.

Figure 3 is a side elevation of the anchor.

Figure 4 is a longitudinal transverse section through the anchor.

Figure 5 is a fragmental, longitudinal transverse section through theupper part of the anchor.

In the form of structure shown in the drawing, the invention comprisesan anchor designated generally at l, the same being made in the form ofa hollow cone and including a hub 2 at its apex, an annular flange orfoot portion 3 ex- (Cl. 18S-90) tended atly outward around the base ofthe cone with the extended plane thereof cutting perpendicularly theaxis of the cone anchor, and a plurality of flat and relatively longribs 4 outstanding upon the outer faces or sides of its integrally andconically formed walls 5. Intermediate the lower outer ends of the ribs4, there are formed an equal number of smaller, relatively short ribs4a. The hub 2 is tapped axially as shown at 6 for the engagement of thethreaded -65 end of an anchor rod 7, in conventional manner, or a squarerecess 8 may be formed at the inner side of the hub for the reception ofa nut 9, the end ofthe rod being then extended through and turned intothe nut.

In use, the anchor l is seated in the bottom of the ground hole 10 andthe rod 7 being screwed home, seals the hollow within the cone, and thishollow tends to form a suction resisting any pull outward upon theanchor rod. When the rocks l are piled in the hole upon the anchor, thesmaller ones 11 will lock in between the adjacent ribs 4 and 4a, andother rocks l2 being then thrown into the hole, they will become bracedbetween the locked rocks l1 and the outer walls 13 of the 89 hole l0, sothat any outward or longitudinal pull upon the rod '7 will result in acounteracting thrust, radially and angularly outward against the sidewalls of the hole, thus staying any movement of the anchor and rod.

The integral and closed form of the cone anchor prevents dirt andsmaller pebbles from falling or passing through from top to bottom aswith other forms. The flat, radial, upstanding ribs serve also tostrengthen the cone, so that thinner cone walls l may be used, requiringless metal. The at, annular foot portion provides a broad sealing basefor seating in the dirt at the bottom of the hole, thus supporting thesuction within the cone. The upstanding ribs also cooperate Awith theconeshaped formation of the relatively thin walls thereof by affordingreinforcing connection and strengthening elements between the hub andannular foot portion. The hollow cone being provided for lesseningtheamount of metal and to provide a suction, it is obvious that supportingelements are necessary for the hub, to prevent same from cracking loosefrom the cone under stresses. The ribs supply such supporting elements.While I have herein described a certain specific manner and method ofconstructing and assembling the elements of my invention, it isunderstood that I may vary from the same in minor details, not departingfrom the spirit of my invenbase of the cone portion and presenting ananchoring surface perpendicular to the axis of the cone portion, and aplurality of relatively thin, flat supporting and strengthening ribsradially outstanding from the outer sides of the Walls of the coneportion and connecting and supporting the hub and foot portion in aspoke-like relation, thus rendering possible the use of the said thin,flat annular foot portion, as aforesaid.

JASPER BLACKBURN.

